Drying-kiln.



m 9 .m m w u d e t n a t a m m K G m an .n W l 0 9 2 6 m N.

(Application filed Oct. 5, 1898.)

- 3 Sheets- Sheet (No Model.)

A H tilllhhl IL IN VEN T OR e.

Altame s.

'm'. 629,202. Patented July 18, I899.

W. B. McHENRY.

DRYING KILN.

(Application filed Oct. 5, 1898.)

680 new.) 3 Sheet-'Sheet '2.

To all'whom it may concern:

UNITE STAT -s WILLIAM 1:. MCHENRY, or GRAFTON, wEsr VIRGINIA;

DRYIN'G-KIILN. I

' srnoxrrcnrion forming part of Letters Pate'nt no. 629,202, dated July is, 1399.

Applicatlon at Dill-0581' 5. 1898.-

Be it known that I, WILLIAM of Grafton, inthe county of Taylor and State of. Vest Virginia, have invented-certainnew and useful Improvements in Drying Kilns;

and I hereby declare that the following i s;a.

- full,- clear, and exact description'thereof, reference being had to he accompanying drawings', which form .part of this specification.-

" 'ing-kilns of the class whichz'are designedfto This invention is an improvement-in drybecperate'd contin nousl-y and wherein the material to be dried is passed gradually through the kiln from the warm to the hottest-portion thereof, soas to be properly dried and bakedduring its passage therethrough. 'The kiln is adapted for drying tel-y, lumber, and other materials in large quantitieseconomically, and may be madeof I dated in the top wall of'the furnace.

various dimensions, according to the mate rial to be dried. Thegeneral-construct on thereof, wherein the, present invention is embodied, will be clearly mderstoml from the following description, taken in connection scribe the construction thereof.

with the-accompanying drawings, forming The invention .1sconc1sely stated in the claims following the description, and without de-. which forms part of the roofof the smoke-flue further preliminaries I will proceed to Referring to the accompanying drawings, Figure 1 is a longitudinal vertical-section.

through the kiln, showing one of the dryingchambers and. the heating apparatus. Fig- 2 isan end elevation thereof on line 2 2, Fig

3. Fig. 3 is-a horizontal sectionon line 3 3,.

; Fig. 2-. Fig. 4 .is'a detail-transverse section drying-chau hdr to the 'rccciringend thorcoflfl on line 4, 4,- Fig. 1 and-Fig; 'tion on line 55, Fig, 4., r I ted with xoneor more; longitudinal drying chambers A,,which' are provided with suitable ffldoorsqagtia their 'oppo-. site ends andwith ,:track's, uponwhich ycars is adetail isec- The .kiln is construe carrying the objects-to be driedg nay berun throughthe kiln; j I,

As shown in the drawings, the 'kil v'idcd with four parallel drying-chatrl'hens A.

Below the discharge endof eachchamher A is a furnace B,"provided with an'ash-pit B and with an outlet or srno'ke fiue' b, which extcndslongitnclinall y beneath the floor of the brickfpot 1' thereof, as shown, and passages E communicate with the drying-chamber through op enings c in the floor thereof, and D comlnuni- "cates with the drying-chamber through open= The openings (Z is pro Serial-No. 692,689. No modelat which point it commilnicates by a lateral passage 12' with a vertical smoke-flue C, which communicates at top with a common flue G,

which leads tolthe vertical common uptake or chimney G, as shownjin Fig. 2.-

I As'indicated inFig. 3, the 'two left-li'and chambers A communicate with verticalfiaes 0 at the left of. the kiln, whilethe' two righthand chambers A'c'o'minunicate with xqerticzil fines C at the right of'the kiln. This enahles' half the kiln to be operated .while the other,"

half is being cleaned or repaired, if desired,

and facilitates-cleaning or repairing ofthe The walls of each furnace B are made hol-' are" arranged one above the other in the (side walls of the furnace, and the passagch is lopassagesF communicate with the drying chamber A-through openings f in the floor ings d in the' floor thereof. are the innermost ones, and between them and openings e and f is a large metallic plate.G,.

b and part of the floor of the drying-chamber.

This plate being thus located near the outletbe the "hottest. The ohject'of this metallic air in'the drying-room The air contacting withthls plate will be more highly heated than that inany other part of .theroom and will rapidly flow upward, and thus produce a creased'bythe draft through the uptake, as" hereinafter explained. The circulation of air will be increas d by the inflow of heated air throughthe openings (1, e, andf, and thef N whole is so arranged that, as willivbe obvious,

plate is toca-nsc a rapid circulation of hot naturalcirculationof air within the dryingroom, whichflcirculation will .be further inthe material to be dried will be subjected'to of 1 kilngi hich is desirable,as the dryingf .the gr '-atost"heat;-m=;l themost 'vfiolent'oith'e hot-air currents as it'nears the. delivery end 65 kiln without entirely stopping-its operation rooms are made very long and the material is moved gradually therctl1rough,'so thatby the time it reaches the delivery end it has been sufliciently dried to prevent injury there-i0 by'thc greater heat and more highly heated currents of air to which it is there subjected.

The draft of the furnaces can be independently regulated by valves'c in the fines (J, as 1o afforded through the dryingrchambers to the uptake C, as indicated .by tailed arrows on the right-hand side of Fig. 2. Ben cath the floor at the receiving end-of the-drying-chamher is a transverse vapor-flue I, which com-- munieates with the drying-chambers through openings '5 in the floor thereof, as indicated in Figs. 2 and 3, and also communicates with the vertical lines J beside smoke-fines C, and these vertical lines J communicate at top with the common fiues C, and through them.

with the commonuptake C", as shown. The iiues J are also provided with cut-oft valves j. W'hen the valves Hare opened the valves 3' should be "closed, and when valves j are open'ed'the valves II should be closed, as indicated in the left-hand side of Fig. 2. Then theheated vapors in the drying-chambers instead of escaping directly upward into the uptake (3 will becompe-lled to pass down through the lioorinto fluesl, and thence through fines J and 0" to the uptake C I am thus enabled to produce either adirect' upward draft through the chambers, as indicated in the right-hand side of- Fig. 2, ora

downdraft through the chambers, as indi-- cated in thelefbhand side of Fig.2. The direct Y upward draft may be employed when the ma.- terialin the kil'ntis perfectly green or very moist, as there will be more vapors generated then, and it is better to permit them-to escape freely; but after the material is partially dried the downdraftmight be mor'e'advantageously employed, and by so doing the heat willbe economized, as it will be retained in the drying-chambers longer and only the heavier and denser portions of the vapors will escape, the lighter, hotter, and drier vapoi-s rising to the top of the chamber and forcing down the denser moist vapors, which pass out through the flues I, J, O, and C, as indicated.

It will be observed that the products of combustion are preferably not admitted onto the material in thegkiln, (although on very coarse material, if desired, they might be admitted by removing the plates G, being conducted through the smoke-fines under the entirelength of the drying-chamber and under the floor thereof, heating the same, and as they escape through the films 0 C they create a natural draft in the uptake and fines sufficient to induce a very rapid circulatiou'of. air through the drying-chamber,

even when the valves ll I are closed and the the material to be dried thereina'nd according to the desired capacity of the kiln. When drying bricks, the relative length of drying-chambers might be about one hundred feet, and thefurnaces and air-fines wouldbe about twenty to twenty fi've feet in length, and they would be so arranged-that the openings'd 'would be about twenty feet' from-the exit of the drying-chambers" Having thus described my invention,-what I' therefore claim as new, and desire to secure by Letters Patent thereon, is-

. 1. In a drying-kiln, the combination' of the 'dryiug-chamber, a furnacefor heating the same, an air-inlet at one end of said chamber, an uptake at the receiving end thereof, and smoke-fines exterior to'the drying-chamber for conducting smoke to the said uptake; with a valve for establishing direct communication between the upper'part of said drying-chamber and said uptake, .audivalved smoke-fines for establishing communication between the bottom part of said drying-chamber, and said uptake,-said valved outlets for located at the end of the-ohamber'opposite the air-inlet, and being adapted to be used alternately, substantially as described.-

2. In a drying-kiln, the combination of the drying ehamber, a furnace for heating thesame at one end thereof, heating-passages beside thefurnace; an uptake at the opposite end of the chamber; and a smoke-flue under the drying-chamber for conducting smoke to said uptake, a valved opening in the top of the drying-chamber, near the inlet end there- .of for establishing'dire'ct communication between the upper part of said drying-chamber and said uptake, and a valved flue for establishing communication between the bottom part of said drying-chamber, and said uptake, said valved outlets for the vapors from the drying-chamber being adapted to-be used alternately, substantially as described. r

3. In a drying-kiln, the combination of the drying-chamber, an uptake at one end thereof, a, furnace undorthe other end thereof, and smoke-fines under the fioorof the drying-chamber for-condlicting the products of combustion from the furnace to the uptake; with a metallic plate forming part of the top of said fine and of the floor of the dryingchamher and local-ml near the primary out- .thevapors firom the drying-chamber, being lot of the'fhrnace so as to be subjected to the most intense heat therefrom, for the pur: pose and substantially as described.

4. In a drying-kiln, the combination of' the drying-chamber, an uptake at the receiving end thereof, a furnace under the discharge end thereof, and smoke-fines under the floor of.

the drying-chamber for conducting the prodnets of combustion from the furnace to the uptake; with air-heating passages in the walls of the furnace, communicating with the interior of the chamber, and a metallic plate forming part of the top of said flue and of the floor of the drying-chamber and located near the primary outlet-0t the furnace so as to be subjected to the most intense heat therefrom,

said air-heating passages opening into said drying-chamber at opposite ends of said metallic plate, for the purpose and substantially as described.

5. In a drying-kiln, the combination of, the drying-chamber, the uptake at the receiving end thereof, the vertical parallel smoke-fine and vapor-flue communicating with said uptake above the top of the drying-chamber, a

valved opening in the top of the drying-chamber near the receiving end thereof, directly communicating with said uptake,and an opening in the floor of said chamber near the receiving end thereof, communicating with the .lower end of said vapor-flue, and a valve in said vapor-flue, said valved opening and said vapor-flue to be used alternately, for the purpose and substantially as described.

6. In a drying-kiln, the combination of the drying-chamber, a furnace under the. dischargeend of the chamber air-heating passages in the walls of the furnace, communieating with said drying-chamber through openings in the floor thereof, a smoke-fine un- 40 derlyiug the floor of the drying-chamber for conducting the Products of combustion from the furnaces to the smoke-flue at the discharge end of the drying-chamber, and a metallic plate forming'part of the top of said horizontal smoke-fi us and of the floor of the dryingchamber and located near the furnace, for the purpose and substantially as described.

7. In a drying-kiln, the combination of the drying-chamber, the uptake at the receiving end thereof, the vertical smoke-flue and vertical vapor-ti ue communicating with said upunderlying the floor of the drying-chamber for conducting the products of combustion from the furnace to the vertical smoke-flue, and a metallic plate forming part of the top of said horizontal smoke-flue and of the floor of the drying-chamber and located near the air-inlets, for the purpose and substantially as described.

,In testimony that I claim the foregoing as my own Ia-fiix my signature in presence of.

two witnesses.

gWILLIAM l3. MCHENRY., In presence of- S. B. TEMPLETON,

ED. CUs'rER. 

